In the modern age of institutions, whistleblowing is now established as one of the most important processes – if not the single most important process – by which governments and corporations are kept accountable to the societies they are meant to serve. This essential Handbook provides researchers and policy makers from around the world with a comprehensive overview of the state of our knowledge regarding this vital process. In addition to drawing from the last 30 years of progressively more systematic research into whistleblowing, it also provides cutting-edge analysis of the conceptual and practical challenges that researchers will want to confront in the next decade.